Climate campaigner Greta Thunberg launched an appeal on Saturday for a change in food production and consumption in the face of repeated crises threatening the world.

"The climate crisis, ecological crisis and health crisis -- they are all interlinked," Thunberg said in a video posted on social media for international biodiversity day.

"Millions have died from Covid-19, Zika, Ebola, West Nile fever, SARS, MERS, HIV-AIDS," *as viruses jump from animals to humans**, "The way we farm and treat nature cutting down forests and destroying habitats, we are creating the perfect conditions for diseases to spill over from one animal to another -- and to us,"

"If we keep making food the way we do we will also destroy the habitats of most wild plants and animals driving countless species to extinction," Thunberg added.

"They are our life supporting system if we lose them we will be lost too."

"When we think about the villains of the climate crisis of course we picture fossil fuel companies but agriculture and land use together are about one quarter of our emissions this is huge,".

"It doesn't have to be like this. If we change towards a plant-based diet we could save up to eight billion tons of CO2 every single year."

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